Type-writing machine.



J. C. MOLAUGHLIN- TYPE WRITING MACHINE. APPLICATION FILED MAR.11, 1908.

926,014. Patented June 22,1909.

Witneas es I 6 5. w Xaaa 1 Azqrrzgy JOHN o. MoLAUGHLIN,

i No. 926,014.

UNITED} STATES PATENT onnion.

OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO UNDERWOOD TYPE- COMPANY, OFNEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

Specification of Letters Patent. Apt'liasti'on filed march 11,1908.

Patented June 22, 1909. Serial no. 420,310.

3T0 all whom it may concern: I Bait known that I, JonN-QMoLAUou- I ,LIN, a citizen of the i is liable to arise from in. Jersey-City,

newfland usefuflmprovements in Type- .Writing Machines, a specification.

mechanisms for typewriting machines, such for instance as disclosed in Letters Patent No. 878,988,.i'n' which either of two ribbons ,to coverthe.

it, since that ing between t 3 into the paths of the type bars and other- Wise to cause trouble.

released so that they may turn freely United States, residin in the county of Hudson an State of New Jersey, have invented certain of which the following is his invention relates totwo-ribbon may be caused to vibrate at the type strokes rinting point, and may also be caused to wind while the other ribbon remainsidle. I

It has been found in practice that trouble accidental movement or of the spools which car?- ortion of the ribbon exten' lib spools is liable to sag down of the idle ribbon The object of the invention is to overcome this difficulty and to prevent accidental longitudinal movement of the idle ribbon.

In carrying out my invention, I mount upon the shifter which brings either pair of spools into use devices which automatically move into engagement with the idle spools; or a part connected thereto, to lock the same, while simultaneously the other spools are.

My improvement may be carrie out in various forms, but is herein illustrated in connection with the detailed ribbon-shifting mechanism illustrated in an application filed by John C. Doane, No. 420,337, in which winding gears are mounted upon swiveled hangers, whereby they may be shifted back and forth between the'spool gears. Upon each of the hangers I mount a 'air of locks, preferably of somewhat yie ding construction, which are swung by the hangers into and out of engagement with the spool gears, so as always to release the active spools and lockthe inactive spools.-

' In the accompanying drawings, Figure 1 is a front view showing the ribbon-winding mechanism at the-left hand side of a front strike writing machine of the Underwoodl type; the outer spools being shown locked and the inner spools released and winding. Fig. 2 shows the winding ear swung to the outer spool gear, the latter being released and .tends in bot bon is carried upon spools l, one at each side The rear' ribbon is of the printing point.

between which the carried upon spools 5', spools 4 are,located. The spools are provided respectively with gears 6, 7.

Between the spool gears at each side ofthe printing point is arranged a windinggear 8, carried u on an upstanding shaft 9, which is rotated y means of a bevel gear 10, the latter constantly in mesh with a gear '11, which is rotated by a ratchet wheel 12 in the usual manner. The shaft 9 is journaled in ears 13, 14, provided up o li a hangerl5, which I is swiveled at its lower end upon a fixed stud or hearing 16. The shafts and hangers are duplicated at opposite sides of the machine,

and the hangers are operated by a lever 17,

whose lower end is connected by a link 18 to the left hand hanger; The up er end of 17 is connected by a link 19 to tlie right hand hanger 15. The lever is mounted upon a rock shaft 20 operatedby keys 21, 22 and the hangers are held in either position l.' means of a detent in the form of a spring 23 pressing a ball 24-aga'inst a boss 25 provided upon the left hand hanger 15 to receive thepivot screw 26 to which this end of the link 18 is attached.

When the hangers 15are swung towardeach other, the winding gears 8 are brought into mesh with the 4; and when the from each other they are brought into mesh with the ears 7 of the outer spools 5.

Upon the top of each hanger, I secure by a screw v27 a iece of spring metal which exdirections from the hanger in the form of arms 28, 29, which carry upturned fingers 30, 31 in position to'be swung by the hanger alternately into mesh with the gears 6, 7, so as to lock one of the gears and release the other, whereby when the inner ears 6 are winding the outer gears 7 are locked-and vice versa. The movement of the fingers 30, 31 is up and down about the pivot 16 sufficiently to lift them into and drop gears 6 of the inner spools .s .e s i er awa. hanger LI hft l The aims 28,

4 scope of the invention, and portionsof the improvements may winding gears to lock the idle spool gears l 2. In a typewriting machine, the combination with two pairs of ribbo i'ispools, of Shift? able. means for causingeither pair to wind while the other pair remains idle at the type claim:

' means connected to said shiftable means for hangers upon which the winding gears are them ontof engagement with the spool gears l at the swinging movements of the hangers 15. 29 are preferably sprmgy to enable them to yield a trifle if theteeth 30, 31 should engage the under sides of the gear teeth during the swinging of the hanger. Either arm will yield sufficiently to permit the completion 'of the movement of the hanger, and thereafter will snap its tooth up between the gear teeth.

Variations may be resorted to withinthe be used without others.

Having thus described my invention,

1 In a typcwriting machine, the cornbina tion with two pairs of ribbon s 001 gears and a air of winding gears shiftab e into and out of mesh with either pair of spool gears, of means connected to be shifted with the against rotation.

strokes, and means connected .to said shi able means for locklng the idlespools against ro.tation. l

3. In a typewriting machine, the combination with two pairs of ribbon spool gears and a pairof winchng gears, of shiftable means to effect engagement between either pair of spool gears and said winding gears, and

engaging the idle gears to lock them agalnst rotation.

4. In a t'ypewriting machine, the combination with two pairs of ribbon spool gears and a pair' of winding gears, of a pair of swiveled mounted, means connecting said hangers to shift the winding gears to either pair of spool gears, and looks upon said hangers and moved. thereby into mesh with the idle spool gears, and out of mesh with the active spool gears.

5. Ina typewriting machine, the combinaa pair of winding gears, of a pair of swiveled hangers uponwhlch the winding gears are mounted, means connectmg said hangers to shift the winding gears to either pair of spool mania and looks upon said hangers and gears, moved thereby into mesh with the idle spool gears, and out of mesh with the active spool.

gears; said locks in the form of yielding fingers mounted upon said hangers.

6. In a typewritin machine, the combination with two pairs of-ribbon spools, of means for locking the spools of either pair simultaneously a ainst rotation, and means to release said ocking means.

' 7. In a typewriting tion with two pairs 0 ribbon spools, of means for simultaneously locking the spools of either pair'against rotation and releasing the spools of the other pair for rotation.

8. In a'typewriting machine, the combination with two pairs of ribbon spool gears and a air of winding gears, of shiftable means to e ect engagement between either pair of spool gears and said winding gears, and means connected to said shiftable means for engaging the idle gears to lock them against rotatlon; said locking means in the form of yielding devices moved into mesh with the teeth of the gears.

9. In a typewriting tion with two pairs of spool gears, and a pair of winding gears, of connected swiveled hangers upon which the winding gears are mounted to shift from one pair of spool gears to the other, and spring-arms secured upon the hangers and extending in both directionsfrom each thereof to be swung by thehangmachine, the combin'amachine, the combinaers alternately into mesh with the idle spool gears to lock themagainst rotation.

10."In a typewriting machine, the combination with two pairs of spool gears, and a pair of winding gears, of connected swiveled angers upon whlch the wmding gears are mounted to shift from one pair of spool gears to the other, and spring-arms secured u on the hangers and extending in both directions from each thereof to be swung by the hangers alternately into mesh with the idle'spool gears to lock them against rotation; said arms having fingers toengage the spool gears and being of springy construction to enable them to yield.

JOHN G. M LAUGHLIN. 

